#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<stdbool.h>
int main()
{
	char str1[10] = "123";
	char str2[] = { "abc" };
	printf("%s", strcat(str1 + 1, str2));
	return 0;
 }